@mirsy
Yes, it is all under the skin.
That's a model of the device, for getting used to it. It's a shame you weren't given one.
There are lots of videos of animations, showing how it works.
But I only found one video of it actually being used.

(naughty bit is around the 6-minute mark. You must be over 18 to view)

Here's another photo of the device & the instruction cards